If you can get one, a four way adjustable comb will offer additional adjustments. Gun fit being as important as it is, an adjustable comb, and an adjustable recoil pad, can get that gun shooting right were you need it. In my opinion they are worth the investment. If you buy a gun that dosen't have these features, an experienced gunsmith should be able to modify, and install them for you.
Often you can find a gun right off the rack that fits and shoots good, but as we are all built different bodywise, often some slight adjustment is needed to get the best out of the gun.